diff --git a/tools/pip-requires b/tools/pip-requires
index a24c146b..47813b52 100644
--- a/tools/pip-requires
+++ b/tools/pip-requires
@@ -2,3 +2,5 @@ argparse
 prettytable>=0.6,<0.7
 python-keystoneclient>=0.1.2
 warlock<2
+httplib2
+iso8601>=0.1.4